THE STAR FORMATION NEWSLETTER an Electronic Publication Dedicated to Early Stellar Evolution and Molecular Clouds

THE STAR FORMATION NEWSLETTER An electronic publication dedicated to early stellar evolution and molecular clouds No. 192 — 6 Dec 2008 Editor: Bo Reipurth ([email protected]) Special Issue Handbook of Star Forming Regions Edited by Bo Reipurth The Handbook describes the ∼60 most important star forming regions within approximately 2 kpc, and has been written by a team of 105 authors with expertise in the individual regions. It consists of two full color volumes, one for the northern and one for the southern hemisphere, with a total of over 1900 pages. The Handbook aims to be a source of comprehensive factual information about each region, with very extensive references to the literature. The development of our understanding of a given region is outlined, and hence many of the earliest studies are, if not discussed, then at least mentioned, even if they are only of historical interest today. Young low- and high-mass populations are discussed, as well as the molecular and ionized gas. The text is supported by extensive use of figures and tables. Authors have been encouraged to complete their chapters with a section on individual objects of special interest. Little emphasis is placed on more general discussions of star formation processes and the properties of young stars, subjects that are well covered elsewhere. The Handbook will thus serve as a reference guide for researchers and students embarking on a study of one or more of these regions, and will hopefully also inspire new work to be done where information is clearly missing. In order to keep the Handbook within some reasonable limits, it was from the beginning decided to limit regions to those closer than approximately 2 kpc. Such a limit of course means that certain famous and important regions are omitted, like NGC 3603, but it is not completely arbitrary, because at around 2 kpc sensitivity and resolution issues start to make more detailed observations of low mass populations very difficult. All chapters are a jour with the literature up to the early summer of 2008. An effort has been made to use illustrations that are helpful to get an overview of important areas or objects in each individual region. Images covering more than a degree on the sky are not always easy to find, but in recent years advanced amateur astronomers have begun to obtain stunning CCD images, and results from some of the best astrophotographers adorn the Handbook. Altogether, the Handbook provides a unique and detailed presentation of our current knowledge about the nearest and most important star forming regions. Astronomical Society of the Pacific ISBN 978-1-58381-670-7, hardbound, 1023 pages, 2008, US$80 ISBN 978-1-58381-671-4, hardbound, 890 pages, 2008, US$80 Available from http://www.astrosociety.org/online-store/scstore/p-MPS01.html or from [email protected] With purchase of the books also comes access to electronic versions of the books. 1 Volume 1 Star Forming Regions along the Milky Way: A Panoramic View Axel Mellinger1,2 1 Institute for Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany 2 Present address: Department of Physics, Central Michigan University, Mount Pleasant, MI 48859, USA E-mail contact: axm at uni-potsdam.de The location of the star forming regions covered in this book is shown superimposed on a panoramic image of the Milky Way. Where are all the Young Stars in Aquila? L. Prato1, E.L. Rice2 and T.M. Dame3 1 Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001, USA 2 Department of Physics & Astronomy, UCLA, Los Angeles, CA 90095-1547, USA 3 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA E-mail contact: lprato at lowell.edu The high Galactic longitude end of the Aquila Rift comprises the large Aquila molecular cloud complex, however, few young stars are known to be located in the area, and only one is directly associated with the Rift. In contrast, the Serpens star-forming region at the low Galactic longitude end of the Rift contains hundreds of young stars. We review studies of the raw molecular material and describe searches for young objects in the Aquila clouds. The characteristics of the known young stars and associated jets and outflows are also provided. Finally, we suggest some possible explanations for the dearth of star formation in this gas-rich region and propose some future observations to examine this mystery further. Star Formation and Young Clusters in Cygnus Bo Reipurth1 and Nicola Schneider2 1Institute for Astronomy, University of Hawaii, 640 N. Aohoku Place, Hilo, HI 96720, USA 2 SAp/CEA Saclay, Laboratoire AIM CNRS, UniversitéParis Diderot, France E-mail contact: reipurth at ifa.hawaii.edu The Great Cygnus Rift harbors numerous very active regions of current or recent star formation. In this part of the sky we look down a spiral arm, so regions from only a few hundred pc to several kpc are superposed. The North America and Pelican nebulae, parts of a single giant HII region, are the best known of the Cygnus regions of star formation and are located at a distance of only about 600 pc. Adjacent, but at a distance of about 1.7 kpc, is the Cygnus X region, a ∼10◦ complex of actively star forming molecular clouds and young clusters. The most massive of these clusters is the 3-4 Myr old Cyg OB2 association, containing several thousand OB stars and akin to the young globular clusters in the LMC. The rich populations of young low and high mass stars and protostars associated with the massive cloud complexes in Cygnus are largely unexplored and deserve systematic study. S106 Klaus Hodapp1 and Nicola Schneider2 1 Institute for Astronomy, University of Hawaii, 640 N. A’ohoku Place, Hilo, HI 96720, USA 2 IRFU/SAp CEA/DSM, Lab. AIM CNRS, 91191 Gif-sur-Yvette, France E-mail contact: hodapp at ifa.hawaii.edu S106 is a bipolar nebula illuminated and excited by a central star called S106 IR. Depending on its distance (literature 2 values range from 500 pc to 5.7 kpc) this star is of late O to early B spectral type. There is evidence that S106 is physically associated with the molecular cloud complex of Cygnus X. The bipolar nebula is the dominant feature in an embedded cluster of young stars forming in a molecular cloud. The bipolar morphology is visible from optical wavelengths into radio wavelengths, implying that it is not caused by foreground extinction. Instead, it is caused by the shadowing effect of a small disk surrounding the exciting star that projects into the surrounding molecular cloud and confines ionizing radiation to the lobes. With the discovery of new star formation sites in S106, i.e. YSOs in the S106 cluster, additional sub-clusters, the Class 0 source S106 FIR, and dense cold cores as reservoirs for new stars, S106 can nowadays be seen as a whole region of active star formation. This view revises earlier interpretations of radio and molecular line observations that saw S106 IR as a single massive protostar with a large accretion disk. Young Stars and Molecular Clouds in the IC 5146 Region G.H. Herbig1 and Bo Reipurth2 1 Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA 2 Institute for Astronomy, University of Hawaii, 640 N. Aohoku Place, Hilo, HI 96720, USA E-mail contact: herbig at ifa.hawaii.edu IC 5146 is both a reflection nebula and an HII region surrounding the B0 V star BD+46o 3474. The region is relatively nearby at 1.2 kpc. It has attracted considerable attention, and has been studied at optical, infrared, millimeter, and radio wavelengths. A substantial population of young low-mass stars exists in the region. IC 5146 is located at the eastern end of a more than 1 degree long cloud filament, which harbors scattered star formation, including the FU Orionis star Elias 1-12 = V1735 Cyg. The Lacerta OB1 Association W.P. Chen1 and H.T. Lee2 1 Institute of Astronomy and Department of Physics, National Central University, 300 Jhongda Road, Jhongli 32054, Taiwan 2 Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23–141, Taipei 10617, Taiwan E-mail contact: wchen at astro.ncu.edu.tw LacOB1 is a nearby OB association in its final stage of star formation. While the member stars suggest an expansion time scale of tens of Myr, the latest star formation episode, as manifested by the existence of massive and pre-main sequence stars, took place no more than a few Myr ago. The remnant molecular clouds in the region provide evidence of starbirth triggered by massive stars. Star Forming Regions in Cepheus Mária Kun1, Zoltán T. Kiss2, and Zoltán Balog3 1 Konkoly Observatory, H-1525 Budapest, P.O. Box 67, Hungary 2 Baja Astronomical Observatory, P.O. Box 766, H-6500 Baja, Hungary 3 Steward Observatory, University of Arizona, 933 N. Cherry Av., Tucson AZ 85721, USA E-mail contact: kun at konkoly.hu The northern Milky Way in the constellation of Cepheus (100 deg ≤ l ≤ 120deg;0deg ≤ b ≤ 20 deg) contains several star forming regions. The molecular clouds of the Cepheus Flare region at b> 10 deg, are sites of low and intermediate mass star formation located between 200 and 450 pc from the Sun. Three nearby OB associations, Cep OB2, Cep OB3, Cep OB4, located at 600–800 pc, are each involved in forming stars, like the well known high mass star forming region S140 at 900 pc. The reflection nebula NGC7129 around 1 kpc harbors young, compact clusters of low and intermediate mass stars.

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